Conversion oil burner



y 1938. R. H. NELSON CQNVERSION OIL BURNER Filed July 24, 1936 2 Sheets-Sheet l May 10, 1938. R. H. NELSON.

. CONVERSION OIL BURNER 7 Filed July 24, 1915-" 2 Sheets-Sheet 2 Patented May 10, 1938 UNITED. STATES CONVERSION on. BUnNEn.

Richard H. Nelson. Moli'ne, Ill., asslgnor to The Herman Nelson Corporation, Molina, 111., a

corporation of Illinois Application July 24, 1936, Serial No. 92,313

Claims. (Cl. 158-28) This invention relates to a conversion type of oil burner, and more particularly to novel features of construction whereby removal of the oil burner nozzle or electrodes for inspection, re- 5 placement, or repair may be more easily effected than heretofore.

In accordance with the principles of this in- .vention there is-prov'ided a removable unit comprising the burner nozzle, electrodes, supporting and spacing bracket therefor and a transformer. This removable unit and the stationary part'of the oil burner with whichthe unit is associated are provided with means for guiding the two into association and for connecting the same together, the construction and arrangement being such that upon connection of the removable unit, electrical connection is automatically established between the primary of the transformer and the source of current,- and similarly upon disconnection of the removable unit, the electrical circuit between the primary of transformer and the source of current is automatically disconnected.

The present invention thus eliminates the possibility of the transformer being improperly connected up to the source of current by the mechanic or other person undertaking to install the burner or to replace parts thereof. It also elimitionary and removable parts are provided with.

fixedly positioned interengageable male and female contact members, which become engaged 35 automatically when the removable and stationary parts are mechanically connected, and become disconnected automatically when the two' parts are separated. The mechanical means provided for connecting the removable unit tothe 40 stationary part of the burner also serve as-guides to properly align the removable part during connection and disconnection and at the same time to align the interengageable male and, female contact members so that no strain is placed upon 5 the latter. that might cause injury to them.

It is therefore an important object of. this invention to provide an oil burner of novel and improved construction, whereby the mechanical assembling and dismantling of the burner proper 50 automatically effects the closing and breaking of an electrical circuit between the transformer and the source of current.

It is'a further important object of this invention to provide a noveltype. :of support for the burner nozzle and electrodes to facilitate their insertion and positioning within the. draft casinc. Other and further important objects of this invention will become apparent from the following description and appended claims. 5

This invention (in a preferred form) is illus-' trated in the drawings and hereinafter more fully described.

0n the drawings:

Figure 1 is a longitudinal sectional view of a 10 conversion type of oil burner embodying the principles of my invention, withiparts in elevation taken along line 11-11 of Figure 2, with the easing removed.

Figure 2 is a broken top plan view, partly in 15 section and with parts'broken away, illustrating the assembly of the removable unit comprising the burner nozzle, electrodes and transformer.

Figure 3 is a view taken substantially along the line m m of Fig. 2.

Figure 4, is a view taken substantially along theline of Fig. 2, with the removable unit removed.

Figure 5 is an enlarged sectional view taken substantially on the line V--V of Fig. 1.

As shown on the drawings:

As shown in Fig. 1, the oil burner .of my inven tion comprises a casing III for enclosing a burner unit mounted upon a base ll. Said burner unit includes a motor l2 having a rotary blower B mounted on one end of its shaft ll and having a fuel pump at its other end within a pump housing l5. Said blower I3 is provided with a separate housing l6, in' the open end of which is mounted a spider I! having a bearing for supporting the forward end of a shaft II. An opening H3 in the outer casing Ill serves to admit air into the'blower [3, from which the air is propelled into a draft casing, indicated generally by the reference numeral l9. s v

A junction block assembly 20 is mounted upon said base H and suitably 'secured to a wall 64 ofthe inner casing l6. Said junctionblock assembly 20, as best shown inFigs. 2 and'4, comprises a casting having a central flanged portion 2| defining an opening 22 therethrough. Said assembly block 20 also carries an electrical socket member 23, having female contact elements 43,

which isflxedlysecured thereto. Wires 24 and 25 lead from said elements 43 to points 26 and 21, 5

respectively, in a junction panel 28. A lead-in conduit 29 extends into a boss 30 on one side of the junction block assembly 20, with the lead-in wires 3| and 32 passing therethrough to points 33 and 21, respectively, in said junction panel 28.

Means, such as bolts 34 and 35, extend from one face of the junction block assembly 20 for connecting to said assembly a transformer mounting 36, which is provided with apertures 31 and 38 for receiving said bolts 35 and 34, respectively. Nuts 39 are adapted to be threaded over the ends of the bolts 34 and 35 to secure the transformer housing 36 in place.

Said housing 36 encases a transformer, the primary of which is connected to the male contact members or prongs 4| of an electrical plug 42. Said prongs 4| extend from the face of said housing 36 for engagement in the female contact elements 43 of the socket member 23 carried by the junction block assembly 26. The interengagement of the male and female contactmembers 4| and 43, respectively, is thus automatically effected when the transformer housing 36 is mechanically connected by means of the bolts 34 and 35 to the junction block assembly 26, said bolts serving to align andguide the parts during connection and disconnection and to prevent any strain being placed upon the prongs 4| that would injure them. a

The transformer housing 36 also carries the electrode rods 44, terminating in the electrode tips 45, and a fuel pipe 46 having a nozzle 41 thereon positioned between the spaced electrode tips 45. A bracket 48 serves to align and support the fuel pipe 46 and the electrode rods 44. Said bracket 48 is provided with openings for receiving insulated portions 49 of said rods 44, and with a central aperture 50 for receiving the fuel pipe 46.

The bracket 48 is of general Y-shape, with an upper pair of surfaces -5| and 52 for sliding engagement with the inner wall of the draft tube l9, and with alower vertical leg .53 carrying a slide plate 54 having a lower rounded surface 55- for resting upon and sliding over the bottom of said draft tube l9. Said slide 54 extends into a slot formed in the leg 53 and is pivotally secured therein by means of a pin 56 (Fig. 1). A spring 51 (Fig. 5) positioned within a recess 58 in saidleg 53 is held under compression between said slide 54 and the bottom of said recess to permit the slide to have limited tilting movement;

A fuel feed line 59 (Fig. 1) leads from the pump housing l5 to an elbow 60 communicating through a passage (5| (Fig. 3) with the fuel pipe 46, A coupling 62 serves to connect the fuel line 59 with said elbow 60 and may be manually disconnected when the transformer housing is to be removed. I

When it is desired to repair the electrode tips 45 or the burner nozzle 41, or make any replacement of these parts, the transformer housing 36, together with the attached transformer, electroderods 44 and the fuel pipe 46 may be removed as a unit by taking. off the nuts 39 and sliding thetransformer housing 36 off of the bolts 34 and 35 (Fig. 2). It will be noted that said bolts 34 and 35 are sufficiently long to serve as guides for the removal of the transformer housing 36 until after the prongs 4| are completely out of the sockets 43. This obviates the possibility of any weight beingplaced upon the .prongs 4| while the prongs are still in the sockets43 and thus bending or otherwise injuring theprongs. 1

the removal of the transformer housing unit,"the 'plate'54 slides over the bottom of the tubmg" l9, while at the same time permitting a little clearance between the surfaces 5| and 52 of the bracket 48 and the upper wall of the draft casing by reason of the curved lower surface 55 with which the plate 54 is provided. Consequently, it is a simple matter to slide the bracket 48 along the bottom of the draft casing and then along the lower surface 63 of the opening 22 in the junction block assembly.

Similarly, in replacing the removable transformer housing, the housing is first supported and guided on the bolts 34 and 35 before the male contact elements or prongs 4| start into the sockets .43. Owing to the fact that the contact members 42 and 23 are fixedly positioned in the transformer housing 36 and the junction block assembly 26, respectively, the making and breaking of the electrical circuit to the transformer primary is automatically effected in the mechanical connecting and disconnecting of the removable transformer housing to the stationary junction block assembly. Consequently, it does not require a skilled electrician to make sure that proper electrical connections are made each time that the parts are reassembled. After assembly, the bracket 48, and more particularly the spring 51 associated therewith, insures the tight mount ing of the fuel pipe and nozzle and the electrode rods within the draft casing and prevents any objectionable vibration of said parts in the casing.

I am aware that many changes may be made and numerous details of construction may be varied through a wide range without departing from theprinciples of this invention, and I, therefore, do not purpose limiting the patent granted 'duit and the primary of said transformer, and

guiding means carried by said unit and part in parallelism with said contact elements to insure straight line movement of said removable unit relative to said stationary part in connection and disconnecting said elements.

- 2. In combination, a removable unit including a transformer and electrodes rigidly extending from the secondary thereof, a. stationary part having a lead-in conduit connected thereto, cooperating male and female contact elements carried by said unit and part for establishing an'electrical connection between said lead-in conduit and the primary of said transformer, and guiding means consisting of alined bolts and sockets carried by said unit and part in parallelism with said contact elements to insure straight line movement of said removable unit relative to said stationary part in connecting and disconnecting said elements.

3. In an oil burner, stationary and removable parts having bolts and bolt receiving sockets which together serve as guiding and connecting means for said parts, said parts having electric contact members comprising male and female interengaging elements in parallelism with said bolts and sockets, whereby said male and female elements are connected and disconnected automatically when said parts are connected and disconnected, said removable part comprising a burner nozzle and electrodes and a transformer, the primary of said transformer being connected to the contact element carried by said removable part and said stationary part having an opening therein through which said burner nozzle and electrodes normally extend.

4. In an oil burner, stationary and removable parts having cooperating means for guiding said parts into and out of connection with each other and having inter-engaging electric contact elements in parallelism with said means and adapted to be automatically connected and disconnected in the operation of connecting and disconnecting 'said parts, said means serving to guide said part:

during the connecting operation before said elec-.

tric contact elements come into inter-engaging relationship, said removable part comprising a burner nozzle and a transformer, the primary of said transformer beingconnected to the contact element carried by said removable part.

5.- In an oil burner having a draft casing, a removable unit carrying the burner nozzle and ignition electrodes insert able in said casing, a fixed member at the entrance end of said casing, said member and said unit having cooperating male and female electrical contacts engageable and disengageable in a straight line movement oi the unit when applied to or removed from operative position with respect to the casing, and a member connected to said nozzle and electrodes near the discharge and of said nozzle and carrying-a springpressed foot engageable with the bottom of the casing for maintaining straight line movement of the nozzle and electrodes as said unit is moved to prevent tilting of the unit which otherwise might 

